import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0,10,1000)
y = np.sin(x) + 1
z = np.cos(x**2) + 1

plt.figure(figsize = (8,4))
plt.plot(x,y,label = '$/sin x+1$',color = 'red',linewidth = 2)
plt.plot(x,z,'b--',label = '$\cos x^2+1$')
plt.xlabel('Time(s)')
plt.ylabel('volt')
plt.title('A Simple Example')
plt.ylim(0,2.2)
plt.legend()
plt.show()